APK installation failed: [INSTALL_FAILED_VERIFICATION_FAILURE]

I'm trying to install an APK on a device running an AOSP build of Jelly Bean (4.2).

When I "adb install my.apk", I get the error:

[INSTALL_FAILED_VERIFICATION_FAILURE]

I've tried using "testsign.jar" to "sign" the apk but it does not change the outcome

You need to disable verification of the APK during ADB install. If the setting in Security is greyed out or isn't working as it should try shelling into the device and, depending on which settings database the setting is in per your API level (Global, System, Secure) run

$ adb shell settings put global verifier_verify_adb_installs 0

If you can actually set it, it will prevent checking of APKs over ADB.

Sometimes you will need to disable the package verifier as well using:

$ adb shell settings put global package_verifier_enable 0

On KitKat, you can see here that these settings are in the Global database:

http://androidxref.com/4.4.2_r2/xref/frameworks/base/core/java/android/provider/Settings.java#5015

Go to developer settings and disable verify apps via USB. Then you can install .apk without any problem.

In your phone,Go to:

setting/DeveloperOption/verify apps over USB

and disable it.

This what worked for, I was trying to install on device with android 6.0

1. Settings > Developer Options > Then Turn off Verify Apps over USB See first image

Then

2. Settings > Security > Then Turn on Unknown sources

Finally

3. Do not forget to uninstall your app and start afresh.

Got to Settings > Developer Options > Then Turn off Verify Apps over

Settings > Security > Then Turn on Unknown sources

UPDATED ANSWER: with the last Android updates, now the following error may show during installation of the APK because of Play Protect:

Failed to finalize session : INSTALL_FAILED_VERIFICATION_FAILURE
Session 'app': Error Installing APKs

In order to fix this (for developer purposes), you may disable Play Protect as it is shown here: [installation app blocked by play protect][1].

[1]: https://stackoverflow.com/a/51797048 "installation app blocked by play protect"

The actual problem is Google play block your app! You need to turn off that

1. Go to the play store
2. Open the drawer and select Play Protect
3. Open the settings and turn off both Scan apps with play protect and Improve harmful app detection
4. Now it's your turn. Rebuild your app and launch it! Good Luck!

You have to allow unsigned applications. The install is being blocked by Android. Allow install of non-market apps in Settings.

Aside from "settings put global verifier_verify_adb_installs 0", I also need to set package_verifier_enable to 0 in my case to make it work.

e.g.

adb shell

settings put global package_verifier_enable 0

None of the suggestions above worked for me, however factory resetting the device did the trick.

delete all directory -> {.gradle, .idea, app/build } and install again working for me

As someone said, you need to have a signed apk to run it.In order to have a signed apk, right click on your project>Android tools>Export signed application package.You will then be prompted to locate your keystore, but if you don't have you can create one.Follow the next steps as guided by eclipse.

You can do this without any instructions like this: Go to settings on your device and then develooper setting and disable the option to confirm apps via usb. (Translation with google translate)

This happened to me in Android Studio after I reinstalled the OS on my PC - I was trying to test a build on a tablet. What ended up working for me was simply uninstalling the application on the tablet (built by the previous installation).

turning on app debug in developer settings solved my problem